Improvement in steam-boilers



y I UNITED STATES PATENT @Erica CHARLES MILES, 0F VINELAND, NEW JERSEY,ASSIGNOR TO HIMSELF l ANDNCHARLES F. JONES, 0F `SAME PLACE.

IMPROVEMENT `IN STEAM-BOILERS.

Specification forming part of Letters Patent No. 42,1143, dated April19, `1864.

To au whom, it may concern,.-

Be it known that I, CHARLES M. MILES, of Vineland, in the count-y ofCumberland and State of New Jersey, have invented a new and usefulImprovement in Steam-Boilers, and I do hereby declare that the followingis a full, clear, and exact description of the same, reference being hadto the accompanying drawings, forming part of this specification, inwhich- Figure 1 is a central vertical section of a steam boilerconstructed according to my invention. Fig. 2 is a horizontal section inthe plane indicated by the line w in Fig. 1. Fig. 3 is a horizontalsection of the same in the plane indicated by the line y y in Fig. 1.

Similar letters of reference indicate corresponding parts in the severalfigures.

This invention consists in a novel arrangement and combination of re andsmoke or gas boxes,water, fire, and gas or smoke tubes and waterspacesin a vertical boiler, whereby I obtain a very large and eli'ectiveheatingsurface and extract from the gaseous products ot' combustion thegreatest possible amount of heat before permitting them to escape to thechimney, and so greatly economize fuel.

To enable those skilled in the art to make and use my invention, I willproceed to de scribe its construction and operation.

A is the outer shell of the boiler, consisting of an upright cylinderwith a hemispherical or dome-shaped top. 1

Bis the tire-box, of upright cylindrical forni, arranged concentricallyWithin the shell A, with an annular water-space, a, all round it, exceptat the fire-door C, and a water-space, b, below it. This lire-boxreaches about halfway to the top of the shell.

Dis a shallow-cylindrical smoke and gas chamber, arranged some distanceabove the fire-box concentric with t-he outer shell, and having awater-space, c, all round it. This chamber is connected with the hre-boxby means of tubes d cl.

E is a larger central vertical tube, descending from the chamber D downthrough the bottom of the shell A, for conveying a large portion of thehot gaseous products of combustion from the said chamber down throughthe center of the body of water in the boiler to a chamber, F, under thebottom of the shell A.

G is a central vertical water-tube, larger than the tube E, surroundingand cencentric with the latter tube, passing through the rebox andsecured in the top and bottom plates, g h, thereof, and forming acommunication between thc lower water-space, b, and the main waterspaceabove the tire-box.

e e are a series of smaller vertical tubes, arranged around the centraltube, E, at equal distances apart,jand forming, like E, communicationsbetween the smoke and gas cham-i ber D and the bottom chamber, F.

f j' are vertical water-tubes, larger than the tubes e e andcorresponding in number therewith, each surrounding one of the tubes ee, passing down through the lire-box and secured in the top and bottomplates, g h, thereof, and

forming communication between the lower water-space, b, and the mainwater-space above the fire-box. The tire-grate H is arranged at asuitable distance from the bottom of the tireebox, and below it,directly under the re door U, there is a door, K, for draft and theremoval of ashes from the bottom plate, h. It will be observed that thetubes f f and G pass right through the grate and are surrounded by theiire.

I is a casing surrounding the shell of the boiler from top to bottom,for conveying escaping gaseous products of combustion from4 the bottomchamber, F, to the chimney J, which is on the top of the boiler. Thegaseous products, escaping through this casing and surrounding theboiler, heat the shell A, and so till their passage to the chimney theirheat is utilized, while it has been so far reduced as to prevent themfrom burning the upper part of the boiler, which contains the steam. It'preferred, this casing may be omitted and the chamber F may communicatewith the chimney through a flue on one side of the boiler. The boiler iskept filled with water to a suitable height above the chamber D, aud-theupper part of the shellA above the water is the steam-space. Fire havingbeen lighted in the grate, the portions of the sides of the firebox andot' the tubes f f and G, which are immediately above the grate,areheated by the direct contact of the incandescent fuel,

While the ame and heated gaseous products of combustion, circulating`over the other parts of the sides ot' the box, around the upper parts ofthe said tubes, and under the top plate, g, ot' the tire-box, heat allthose parts and generate steam from the Water in contact with them. Fromthe [ire box the flame and gases pass upward through the tubes d d tothe smoke and gas chamber D, the Whole of whose exteriors constituteheating-surface. From thence the heated gaseous products pass throughthe tubes e e and E t0 the chamber F, and thence to the chimney. Thebottom plate, h,`of the tirebox also presents a heatingsurface,receiving heat by radiation from the re between the grate-bars and fromthe hot cinders which fall through. Thus it will be seen that a veryextensive heating-surface is 2. In combination with the parts .abovespecified, the casing I, applied substantiallyr as described.

CHARLES M. MILES.

Witnesses: I v

JAMES H. NIKON, E. P. MoaEHoUsE.

